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It's a way to remember the fallen workers, but also to stress safety among drivers passing through work zones.

PennDOT said there were more than 1,600 crashes in Pennsylvania work zones last year. Those accidents saw 21 people killed, including five in the District 11, which covers Allegheny, Beaver and Lawrence counties. Three highway workers were among the 21 fatalities.

"Since the beginning of the year on the Squirrel Hill Tunnel (construction), the Pennsylvania State Police have written 146 citations and warnings and arrested 10 motorists for impaired driving," said PennDOT district executive Dan Cessna.

Under Pennsylvania law, drivers who get caught going 11 mph or more above the posted speed limit in an active work zone or are involved in a crash in an active work zone and convicted of failing to drive at a safe speed will lose their driver's licenses for 15 days.

Also, fines for violations like speeding and driving under the influence in Pennsylvania are doubled in an active work zone.